Industrial Current Out Driver, Single-Supply,

55 V Maximum Supply, Programmable Ranges

AD5749

Rev. 0

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FEATURES

Current output ranges: 0 mA to 24 mA or 4 mA to 20 mA

±0.03% FSR typical total unadjusted error (TUE)

±5 ppm/°C typical output drift

2% overrange

Flexible serial digital interface

On-chip output fault detection

PEC error checking

Asynchronous CLEAR function

Power supply range

Temperature range: −40°C to +105°C

32-lead, 5 mm × 5 mm LFCSP package

APPLICATIONS

Process control

Actuator control

PLCs

FUNCTIONAL BLOCK DIAGRAM

*DENOTES SHARED PIN. SOFTWARE MODE DENOTED BY REGULAR TEXT,

HARDWARE MODE DENOTED BY ITALIC TEXT. FOR EXAMPLE, FOR

FAULT/TEMP PIN, IN SOFTWARE MODE, THIS PIN TAKES ON FAULT

FUNCTION. IN HARDWARE MODE, THIS PIN TAKES ON TEMP FUNCTION.

CLEAR

DVCC GND

AVDD GND

CLRSEL

HW SELECT

VIN

VREF

OVERTEMP

IOUT OPEN FAULT

IOUT OPEN FAULT

RESET

R2

AVDD

R3

AD5749

IOUT

POWER-

ON RESET

IOUT

OPEN FAULT

IOUT RANGE

SCALING

STATUS

REGISTER

INPUT SHIFT

REGISTER

AND

CONTROL

LOGIC

SCLK/OUTEN*

SDIN/R0*

SYNC/RSET*

SDO/VFAULT*

FAULT/TEMP*

NC/IFAULT*

AD2/R1*AD1/R2*AD0/R3*

REXT1

REXT2

Figure 1.

GENERAL DESCRIPTION

The AD5749 is a single channel, low cost, precision, current output

driver with hardware or software programmable output ranges.

The software ranges are configured via an SPI-/MICROWIRE™-

compatible serial interface. The AD5749 targets applications in

PLC and industrial process control. The analog input to the

AD5749 is provided from a low voltage, single-supply digital-to-

analog converter (DAC) and is internally conditioned to provide

the desired output current/voltage range.

The output current range is programmable across two current

ranges: 0 mA to 24 mA, or 4 mA to 20 mA. Current output is

open-circuit protected and can drive inductive loads of 0.1 H.

The device is specified to operate with a power supply range

2.75 V.

The flexible serial interface is SPI and MICROWIRE compatible

and can be operated in 3-wire mode to minimize the digital

isolation required in isolated applications. The interface also

features an optional PEC error checking feature using CRC-8

error checking, useful in industrial environments where data

communication corruption can occur.

The device also includes a power-on reset function ensuring

that the device powers up in a known state and an asynchron-

ous CLEAR pin that sets the outputs to the low end of the

selected current range.

An HW SELECT pin is used to configure the part for hardware

or software mode on power-up.

Table 1. Related Devices

Part No.

Description

AD5750

Industrial current/voltage output (I/V) driver with

programmable ranges

AD5751

Industrial I/V output driver, single-supply, 55 V maximum

supply, programmable ranges

AD5748

Industrial I/V output driver with programmable ranges

AD5410/

AD5420

Single-channel, 12-/16-bit, serial input, current source

output DAC

AD5412/

AD5422

Single-channel, 12-/16-bit, serial input, I/V output DAC